I'm looking for a way to have my iPhone speak battery status periodically, any help?

Hi.

The subject says it all. I'm looking for a way to have my iPhone speak battery harge or discharge percentages that will inform me about the battery charge, similar to how battery monitor speaks battery status on the mac. I could do this when jailbroken, but since I'm running 8.3, I can't jailbreak. Does anyone know of an app that will allow me to do this?